ABOUT THE ORIGIN OF 1RS.1BL WHEAT-RYE CHROMOSOME TRANSLOCATIONS FROM GERMANY

In order to investigate the origin of two of the German 1RS.1BL wheat- rye translocations used world-wide in breeding, a number of DNA probes were considered which (a) were critical for the short arm of the rye chromosome 1R and (b) should show a specificity for the gene pool of P etkus rye. The DNA probe CDO580 was revealed as a specific one. (1) It clearly differentiated 1RS.1AL ('Amigo'), 1RS.1BL ('Salmon') and 1RS. 1DL ('Gabo') from the two German sources. (2) Both translocation wheat s deriving from the Weihenstephan (Munich) and from the Salzmunde (Hal le/S.) origin showed an identical DNA fragment which was typical for t he gene pool of Petkus rye. It is supposed that both German sources ha ve one progenitor in common.